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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9c00497e0f9186ce9e989ee3638eb6b35b319e9f028f91308fcf37480b480b' 
  AND token = 'izml4hFSCJ6uBWYI/rWAO42XO3Y2fjENmnu9ANQ4KPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}